Method of and apparatus for producing sub-micron bubbles in liquids, slurries, and sludges

Abstract

In a method of and apparatus for producing sub-micron bubbles in liquids, slurries, and sludges, gas is maintained on the interior of the gas permeable partition at predetermined pressure. Relative movement between the gas permeable partition and the surrounding material forms sub-micron sized bubbles in the liquid, slurry, or sludge.

I claim:  
     
         1 . An apparatus for producing sub-micron bubbles in a quantity of sludge comprising: 
 a hollow chamber positioned in the water and including a gas permeable partition engaging the sludge;    apparatus for maintaining gas within the interior of the hollow chamber at a predetermined pressure sufficient to cause gas flow through the gas permeable partition while preventing liquid flow therethrough; and    at least one propulsion jet mounted on the hollow chamber and connected in fluid communication therewith for discharging a gas jet and thereby causing relative movement between the gas permeable partition and the liquid.    
     
     
         2 . The apparatus according to  claim 1  wherein the gas permeable partition comprises a sintered stainless steel partition.  
     
     
         3 . The apparatus according to  claim 1  wherein the gas permeable partition comprises a sintered glass partition.  
     
     
         4 . The apparatus according to  claim 1  wherein the gas permeable partition comprises a sintered ceramic partition.  
     
     
         5 . The apparatus according to  claim 1  wherein the hollow chamber comprises a hollow disk.  
     
     
         6 . The apparatus according to  claim 1  wherein the propulsion jet causes rotation of the gas permeable partition relative to the liquid.  
     
     
         7 . A method for producing sub-micron bubbles in liquids comprising: 
 providing a quantity of sludge;    providing a hollow chamber including a gas permeable partition;    positioning the partition of the hollow chamber in the sludge;    maintaining gas within the interior of the hollow chamber at a predetermined pressure sufficient to cause gas flow through the gas permeable partition while preventing liquid flow therethrough; and    discharging a gas jet from the hollow chamber and thereby causing relative movement between the gas permeable partition and the liquid.    
     
     
         8 . The method according to  claim 7  wherein the gas permeable partition comprises a sintered stainless steel partition.  
     
     
         9 . The method according to  claim 7  wherein the gas permeable partition comprises a sintered glass partition.  
     
     
         10 . The method according to  claim 7  wherein the gas permeable partition comprises a sintered ceramic partition.  
     
     
         11 . The method according to  claim 7  wherein the hollow chamber comprises a hollow disk and wherein the gas jet is discharged relatively tangentially thereto.  
     
     
         12 . The method according to  claim 7  wherein the step of causing relative movement between the gas permeable partition and the liquid comprises rotating the gas permeable partition relative to the sludge under the action of the gas jet.